I respectfully disagree with the posters below. If you ask in a logical, respectful manner, I see no reason why financial aid personnel (not "the school") would be offended. You can't know if you don't ask. College admissions officers encourage students to bargain with schools, and I don't see why graduate school should be any different. I would approach it by having a meeting (in person is preferable, but phone will do) with a financial aid rep and saying that you really want to attend, but the cost is unsettling. Ask if there is any way they can offer you more assistance, and ASK THAT YOUR FILE BE REVIEWED AGAIN. Offer to provide additional documentation. I know that different officers can lead to different aid packages, so if you can find someone in particular who is great (ask current students; they will often know) and personally ask that officer to take a look at your file, do it. You honestly have nothing to lose.